In 2011, a strong earthquake of magnitude 9 occurred in Japan, a nuclear leak occurred in Fukushima, and nuclear radiation enveloped Japan. Jia Jia (played by Yan Liu) took the risk to go to Japan with her fiancé to meet his family. As soon as she arrived at the Akaishi Hot Springs at the foot of Mount Fuji, she was imprisoned by local villagers and lived an inhuman life of confinement. The cowardly Hongtai only knew how to drown his sorrows in alcohol. Jia Jia's good sister Wei Ling (played by Christy Chung) resolutely went to Japan to find Jia Jia. With the help of agent Kinoshita (played by Lee Cansen), the investigation gradually deepened, but the surrounding environment became more and more dangerous. Hongtai was strangled to death in the hot spring pool, Michiko fell into madness due to extreme fear, Setsuko was attacked and was conscious but unable to express herself, Zhongnan often peeked at Wei Ling through the crack in the door, and the residents under the shadow of nuclear radiation gradually lost their humanity, like hyenas, ready to bite Wei Ling, an outsider, at any time... People around them died one by one, and terrorist incidents gradually escalated. There are even bigger secrets hidden behind all this...